On Fri, May 27, 2022 at 11:28:59PM +0200, Konrad Dybcio wrote: > From: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxxx> > > Some IOMMUs associated with some TZ firmwares may support switching > to the AArch64 pagetable format by sending a "set pagetable format" > scm command indicating the IOMMU secure ID and the context number > to switch. > > Add a DT property "qcom,use-aarch64-pagetables" for this driver to > send this command to the secure world and to switch the pagetable > format to benefit of the ARM64 IOMMU pagetables, where possible. > > Note that, even though the command should be valid to switch each > context, the property is made global because: > 1. It doesn't make too much sense to switch only one or two > context(s) to AA64 instead of just the entire thing > 2. Some IOMMUs will go crazy and produce spectacular results when > trying to mix up the pagetables on a per-context basis. > > Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxxx> > Signed-off-by: Marijn Suijten <marijn.suijten@xxxxxxxxxxxxxx> > Signed-off-by: Konrad Dybcio <konrad.dybcio@xxxxxxxxxxxxxx> > --- > .../devicetree/bindings/iommu/qcom,iommu.txt | 2 + Bindings should be separate patch. As you are making multiple changes, please convert this to DT schema first. > drivers/iommu/arm/arm-smmu/qcom_iommu.c | 54 +++++++++++++++---- > 2 files changed, 47 insertions(+), 9 deletions(-)
